JP4777048B2 - Tool holding device - Google Patents

Description

  The present invention relates to a tool holding device.

  Conventionally, a tool holding device (hereinafter referred to as a conventional example) that holds a pull stud 3 of a tool holder A mounted in a holding hole 2 of a spindle 1 of a machine tool such as a machining center has been proposed.

  In addition, the same code | symbol was attached | subjected to the same component as a present Example.

  Specifically, in this conventional example, a claw member 4 that holds and releases the pull stud 3 of the tool holder A that is mounted in the holding hole 2 of the spindle 1 of the machine tool is arranged around, and the claw member 4 is moved. The pull stud 3 is held, and the claw member 4 is pushed to release the hold of the pull stud 3.

  By the way, in the conventional example, an annular body 8 (spring) that urges the claw member 4 inwardly is fitted on the proximal end side of the claw member 4, and this annular body 8 attaches the claw member 4 to the drawbar. When the front end of the claw member 4 is moved outward and released, the open state is maintained. In the open state of the claw member 4, the pull stud 3 held by the claw member 4 is extracted, and the pull stud 3 to be held by the claw member 4 is inserted.

  However, in the conventional example, when the claw member 4 is in an open state (particularly in a sideways open state), each tip of the claw member 4 does not move evenly in the radial direction due to its own weight, and a good open state is obtained. It may not be possible. Generally, the upper claw member 4 has a small opening (moving upward) and the lower claw member 4 has a large opening (moving downward), but the position of each claw member 4 (claw member 4). Are laterally oriented, and whether or not each claw member 4 is in a position displaced from the vertical direction), a decrease in urging force accompanying the deterioration of the annular body 8, and the like are often hindered. FIG. 9 shows a state in which the opening of each claw member 4 is not uniform because the claw member 4 is displaced from the vertical direction L. In addition, the imaginary line in FIG. 9 is the state before the nail | claw member 4 opens.

  Therefore, if the pull stud 3 is pulled out or inserted in this incomplete open state, the tip of the claw member 4 and the pull stud 3 collide with each other, and the colliding portion between the claw member 4 and the pull stud 3 is damaged. And problems such as inability to quickly attach and detach the tool holder. This problem becomes conspicuous with a decrease in the urging force of the annular body 8 over time.

  As a result of various experiments and researches, the present inventors have developed an epoch-making tool holding device that exhibits unprecedented effects.

  The gist of the present invention will be described with reference to the accompanying drawings.

Claw member 4 for holding open a pull stud 3 of the tool holder A to be attached to the holding hole 2 of a spindle 1 of a machine tool is disposed around, the claw member 4引動holds the pull stud 3, this The claw member 4 has a draw bar 5 that pushes the claw member 4 to release the holding of the pull stud 3, and the claw member 4 is pulled by the draw bar 5 so that the base end portion is outward and the front end The portion is moved inward to hold the pull stud 3, and the pull stud 5 is pushed to move the proximal end portion inward and the distal end portion outward to move the pull stud. 3 is released so that the claw member 4 protrudes toward the distal end of the claw member 4 when the claw member 4 is released. It abuts the proximal end group of the pawl member 4 Parts and abutment attracting body 6 is provided to move the inward, the abutment attracting body 6 is a ring member which is fitted slidably moved to the draw bar 5, the contact attracting body 6 is provided with a tapered surface 6a that expands toward the distal end side and comes into contact with the proximal end portion of the claw member 4, and the tapered surface 6a of the contact attracting member 6 pushes the draw bar 5. The base end portion of the claw member 4 is pressed to move away from the base end portion of the claw member 4 when the draw bar 5 is moved. The taper surface 6a of the body 6 is provided with an expansion / contraction ridge 7 that presses and urges the proximal end portion of the claw member 4, and further, a long window-like through hole 6b is provided on the peripheral surface of the contact attracting body 6. In this through hole 6b, a retaining member 21 provided in the draw bar 5 is located. The contact attracting body 6 is provided so as to be slidable in the axial direction of the draw bar 5 with respect to the draw bar 5 within a range in which the blocking member 21 moves in the through hole 6b. The present invention relates to a tool holding device.

The tool holding device according to claim 1, wherein four claw members 4 are annularly arranged around the draw bar 5 .

The tool holding device according to any one of claims 1 and 2, wherein the expansion / contraction ridge 7 is a coil spring .

Further, in the tool holding device according to any one of claims 1 to 3, a plurality of the through holes 6b are provided in the upper and lower positions of the circumferential surface of the contact attracting body 6, and the draw bars are provided in the through holes 6b. 5 is a tool holding device characterized in that a retaining member 21 provided in 5 is positioned .

  Since the present invention is configured as described above, unlike the above-described conventional example, each tip portion of the claw member can be moved evenly in the radial direction to obtain a favorable open state. The breakage of the tool holder can be prevented as much as possible, and the tool holder can be detached and attached quickly and reliably.

  DESCRIPTION OF EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the drawings showing the operation of the present invention.

  In the present invention, when the holding of the pull stud 3 is released, the claw member 4 protrudes toward the distal end of the claw member 4 and comes into contact with the proximal end portion of the claw member 4 to move the proximal end portion of the claw member 4 inward. Since the contact and attracting body 6 is provided, even if the claw member 4 is in the lateral state, the base end portion of the claw member 4 is forcibly moved inward, whereby the tip of the claw member 4 is moved. The part is opened, so that an even open state of the claw member 4 is obtained.

  Therefore, the claw member 4 and the pull stud 3 can be prevented from being damaged as much as possible, and the tool holder A can be attached and detached quickly and reliably.

Further, a ring member abutment attracting body 6 is fitted in the drawbar 5, because that has a base end portion of the expansion as the distal end side and the claw member 4 and abuts tapered surface 6a is formed on the tip end inner peripheral surface Further, a force (a force for moving inward) can be equally applied to the plurality of claw members 4, and each tip portion of the claw member 4 can be evenly opened.

Further, abutment attracting body 6 is configured to be provided on the drawbar 5 via the scaled power spring 7 treasure, it is possible to move the base end portion of the claw member 4 to more smoothly inward, moreover, the contact pull pulling Compared to the case where the body 6 is integrally formed with the draw bar 5, for example, the case where the expansion and contraction ridge 7 is interposed does not require high accuracy with respect to the contact attracting body 6, and the cost is reduced accordingly. It will be excellent in mass productivity.

  Specific embodiments of the present invention will be described with reference to the drawings.

  In this embodiment, as shown in FIG. 1, a claw member 4 for holding and releasing the pull stud 3 of the tool holder A mounted in the holding hole 2 of the spindle 1 of the machine tool is disposed around the claw member 4. It has a draw bar 5 that holds the pull stud 3 by pulling and releases the holding of the pull stud 3 by pushing the claw member 4.

  Hereinafter, each component according to the present embodiment will be described in detail.

  As shown in FIGS. 1 and 2, the claw member 4 is composed of an appropriate metal member, is divided into four pieces, and is annularly disposed around a draw bar 5 described later. It arrange | positions in the sleeve 14 mentioned later.

  Each claw member 4 has a closing projection 9 formed on the outer peripheral surface of the distal end portion, a holding projection 10 formed on the inner peripheral surface of the distal end portion, and the engaging projection 11 and the engaging projection on the inner peripheral surface of the base end portion. A concavity 22 is formed.

  Further, the claw member 4 is provided with a protrusion 13 having a tapered portion 12 on the outer surface on the proximal end side.

  The tapered portion 12 of the protrusion 13 is configured to match the tapered portion 15 formed on the sleeve 14 when the draw bar 5 is pushed to release the holding of the pull stud 3 by the holding protrusion 10. Yes. Therefore, the taper portion 12 related to the protrusion 13 acts when the tip portion of the claw member 4 is moved outward, and the tip portion of the claw member 4 moves outward so that the tip of the claw member 4 is moved. The holding of the pull stud 3 is released.

  Further, as shown in FIG. 2, the claw member 4 is formed with a groove 20 on the outer peripheral surface of the base end portion of each claw member 4, and a spring ring as an annular body 8 having elasticity is fitted in the groove 20. This type of spring ring 8 constantly biases the base end of the claw member 4 inward. Therefore, when the claw member 4 holding the pull stud 3 is pushed, the tip of the claw member 4 is smoothly moved outward by the annular body 8.

  1 and 2, the draw bar 5 is composed of an appropriate metal member, and can be pushed and pulled by an appropriate means (cylinder mechanism not shown) in a sleeve 14 provided on the main shaft 1. And a push / pull movement unit 16 that is connected to the tip of the push / pull movement unit 16 and engages with the claw member 4 to open and close the claw member 4. Has been.

  The push-pull operating portion 17 has a protrusion 18 that engages with the engagement protrusion 11 and the engagement recess 22 of the claw member 4 on the base end side outer peripheral surface, and the base end side peripheral surface of the protrusion 18 A tapered portion 18a having a smaller diameter toward the proximal end side is formed, and a tapered portion 18b having a smaller diameter toward the distal end side is formed on the distal end side peripheral surface.

  Further, the draw bar 5 is fitted with a cylindrical abutting and attracting body 6 at a tip end portion of the push / pull moving portion 16.

As shown in FIG. 2, the abutment attracting body 6 is composed of an appropriate metal member, and a long window-like through hole 6b is formed at the upper and lower positions of the peripheral surface. A retaining member 21 is passed through 6b, and the retaining member 21 is secured to the draw bar 5 , so that the abutment attracting body 6 is retained by the draw bar 5 (push / pull movement unit 16). The contact attracting body 6 is slidable in the axial direction of the draw bar 5 with respect to the draw bar 5 within a range in which the retaining member 21 moves relative to the through hole 6b. FIG. 6 shows another type of retaining member 21 that is secured to the draw bar 5 in a penetrating state.

  Further, the abutment attracting body 6 is formed with a tapered surface 6a that is expanded toward the distal end side on the inner peripheral surface of the distal end, and this tapered surface 6a abuts the proximal end side of the claw member 4 arranged in an annular shape. It is.

  Further, the contact attracting body 6 is always urged toward the tip end side of the draw bar 5 by the expansion / contraction ridge 7 (coil spring) fitted to the push / pull moving portion 16.

  Therefore, the taper surface 6a of the front end portion of the contact attracting body 6 abuts on the base end portion of the claw member 4 and is urged by the expansion / contraction ridge 7 so that the taper surface 6a of the contact attracting body 6 is the claw member 4. The base end of the claw member 4 is moved inward by pressing the base end.

  From this configuration, when the claw member 4 in the closed state illustrated in FIG. 7 is opened, the distal end portion of each claw member 4 is evenly moved in the radial direction as illustrated in FIG. become.

  The sleeve 14 is an appropriate metal cylindrical body as shown in FIGS. 1 and 2, and the sleeve 14 is disposed in the interior hole 19 that communicates with the holding hole 2 provided in the main shaft 1.

  Further, the sleeve 14 has a tapered portion 15 formed on the inner peripheral surface on the proximal end side.

  The tapered portion 15 is configured to be able to match the tapered portion 12 formed on the outer peripheral surface of the base end side of the claw member 4, and when the claw member 4 is moved to the base end side, the claw member 4 It acts when moving the tip of the inward or outward.

  Reference numeral 23 also forms a pair with the concave portion 24 on the peripheral surface without the claw member 4 and exhibits the same action as the pair of the protruding portion 18 and the engaging concave portion 22.

  The operation of the present embodiment having the above configuration will be described.

When the draw bar 5 is pulled from the state of FIG. 5, the tip of the claw member 4 is moved inward relative to the annular body 8 by the taper portion 18a and the taper portion 11a of the engagement protrusion 11 (see FIG. 4). When the pull stud 3 is held by the holding protrusion 10 and the draw bar 5 is further moved, the pawl member 4 is also moved together, and the taper action of the taper part 12 and the taper part 15 acts, and the protrusion 13 becomes the diameter of the sleeve 14. located in most 14a, the tip portion of the claw member 4 is further located inwardly, and the closure projection 9 taper surface 6a also the claw member 4 in the body 6 abut attracting supported on the inner surface of the sleeve 14 Thus , the pull stud 3 is completely held (see FIG. 3).

  Next, when releasing the holding of the claw member 4 with respect to the pull stud 3 of the tool holder A, when the draw bar 5 is pushed from the state of FIG. 3, the protrusion 18 engages with the engagement recess 22, and the tip of the protrusion 18 The taper portion 18b on the side and the taper portion 22a on the distal end side of the engagement recess 22 are in contact with each other, and the taper surface 6a of the contact attracting member 6 is also in contact with the proximal end portion of the claw member 4 so that the claw member is also at the front end. The tip of the claw member 4 moves outward by the taper action of the taper portion 12 of the protrusion 13 and the taper portion 15 of the sleeve 14, and the closing protrusion 9 of the claw member is moved to the sleeve. When detached from 14, the tip of the claw member 4 is moved outward by the taper action of the tapered surface 6a of the annular body 8 and the contact attracting body 6, and the holding of the pull stud 3 is released (see FIG. 5).

  When the holding of the claw member 4 with respect to the pull stud 3 is released, the proximal end portion of the claw member 4 is moved inward by the pressing of the distal end portion (tapered surface 6a) of the contact attracting body 6 biased by the expansion / contraction ridge 7. The tip part is moved outward by being moved outward, and the open state of the claw member 4 in which the tip part has moved outward is maintained.

  At this time, the claw member 4 is uniformly applied with a force to the base end portion of the claw member 4, and each distal end portion of the claw member 4 is moved evenly in the radial direction. An open state can be obtained.

  Since the present embodiment is configured as described above, damage to the claw member 4 and the pull stud 3 can be prevented as much as possible, and the tool holder A can be attached and detached quickly and reliably. .

  Further, in the present embodiment, the contact attracting body 6 is an annular body fitted on the draw bar 5, and a tapered surface 6 a that expands toward the inner peripheral surface of the distal end toward the distal end side and contacts the proximal end portion of the claw member 4. Since it is formed, force (force to move inward) can be equally applied to the plurality of claw members 4, and each tip of the claw member 4 can be evenly opened. Become.

  Moreover, since the present embodiment has a configuration in which the contact attracting body 6 is provided in the draw bar 5 via the expansion and contraction ridge 7, the base end portion of the claw member 4 can be moved more smoothly inward, In addition, compared with the case where the contact attracting body 6 is integrally formed with the draw bar 5, for example, higher accuracy is required for the contact attracting body 6 when the expansion / contraction ridge 7 is interposed. Therefore, it will be excellent in mass productivity at a lower cost.

  Note that the present invention is not limited to this embodiment, and the specific configuration of each component can be designed as appropriate.

It is explanatory drawing of the principal part which concerns on a present Example. It is a disassembled perspective view which shows a present Example. It is operation | movement explanatory drawing of a present Example. It is operation | movement explanatory drawing of a present Example. It is operation | movement explanatory drawing of a present Example. It is explanatory drawing of the principal part which concerns on another Example. It is operation | movement explanatory drawing of the principal part which concerns on a present Example. It is operation | movement explanatory drawing of the principal part which concerns on a present Example. It is operation | movement explanatory drawing of the principal part which concerns on a prior art example.

A Tool holder 1 Spindle 2 Holding hole 3 Pull stud 4 Claw member 5 Draw bar 6 Contact attracting member 6a Tapered surface
6b through hole 7 expansion and contraction
21 Retaining member

Claims (4)

Pawl member for holding open a pull stud of the tool holder to be attached to the holding hole of the main spindle of a machine tool is disposed around, the claw member is引動holds the pull stud, and pushing the pawl member The claw member has a draw bar for releasing the holding of the pull stud, and the claw member is moved by the draw bar so that the base end portion moves outward and the tip end portion moves inward to the pull stud. The holding is executed, and the base end is moved inward and the distal end is moved outward by being pushed by the draw bar, so that the holding with respect to the pull stud is released. when the base end side of the claw member release of holding for the pull stud, in contact with the base end portion of the pawl member projecting distally of said pawl member, moving the base end portion of the pawl member inwardly An abutment attracting body is provided. Are, the abutment attracting body is a ring body which is fitted slidably moved to the draw bar, the proximal end of the abutment to the distal end inner peripheral surface of the attracting body flared as distal side said pawl member A taper surface that comes into contact with a portion is provided, and the taper surface of the contact attracting member presses the base end of the claw member when the draw bar is pushed, and the claw when the draw bar is moved. The draw bar is provided with an expansion / contraction ridge in which the taper surface of the abutting attracting member presses and urges the base end of the claw member, and is further provided on the draw bar. A long window-like through-hole is provided on the peripheral surface of the attracting member, and a retaining member provided in the draw bar is located in the through-hole, and the retaining member moves in the through-hole. The abutting attracting body is within a range of the draw bar with respect to the draw bar. Tool holding device, characterized in that provided slidably move in the direction. 2. The tool holding device according to claim 1, wherein four claw members are annularly arranged around the draw bar. The tool holding device according to any one of claims 1 and 2, wherein the expansion / contraction ridge is a coil spring. The tool holding device according to any one of claims 1 to 3, wherein a plurality of the through holes are provided at positions above and below the circumferential surface of the contact attracting body, and the through holes provided in the draw bar are provided in the through holes. A tool holding device in which a stop member is positioned.

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